smith



- W. W. SMITH Filed Dec. 15, 1923 4 sheets-Sheet. 2

Oct. 2, 1928. 3,5,962

W. W. SMITH Filed Dec. 15, 1925 4 Sheets-Sheet'I 4 Patented ct. 2, 1828.

W. SMITH, F JERSEY CITY, NEW JERSEY.

BOHJER.

Application filed December 15, 1923.

rlhis invention relates to water tube boilers and aims to provide animproved structure which can be readily erected and one which iscomparatively inexpensive to build.

Two embodiments of the invention are illustrated in the accompanyingdrawings in which;

Fig. 1 is a side elevation o the boiler the left side of the figurebeing broken away to reveal interior parts;

Fig. 2 is a transverse vertical section taken Fig. 3 is aside elevationshowing a modilied :torm of boiler;

Fig. 4 is a transverse section on the line 4-4 of Fig. 3;

Fig. 5 is a detailed section on the line 5-5 of Fig. 2; i

Fig. 6 is an enlarged detail showing one of the plates forming partofthe baille wall.

Figs. 7 and 8 are detail views.

Referring in det-ail to the drawings the boiler shown in Figs. 1 and 2includes lower sup-porting end walls 2 and 4, side walls 6 and 8 whichenclose a heating chamber 10. This chamber is divided into twocompartments 12 and 14 by a central longitudinal wall 16. The wall 16lis provided with a pair of arched openings 18 and 20 and the end wall 4is provided with an arched opening or port 22 which communicates with altunnel orY flue coming from the regenerator chambers of an open hearthfurnace, this boiler being adapted to utilize waste heat from steelfurnaces or the like.

Located on opposite sides of the heating chamber are lower drums 24 and26 which are l connected by means of a multiplicity of boiler tubes 28and 30 with a drum or steam header 32 located above the central wall 16.

Steel I-beams 34 and 36 are located on opposite sides of the steamheader 32 and carry on their undersides channel beams 38 and 40. Outerboiler shells 42 and 44 are secured at their upper ends to the channels38 and 40 as shown and at their lower ends to angle plates 46 and 48 asshown. The boiler shells 42 and 44 are formed ot separate panels 53 asshown in Fig. 1 and each panel comprises an outer plate 50 and an innerplate 52 between which is located a layer of magnesia 54 or othersuitable heat insulating material.

The shells 42 and 44 are arched -or bowed as best shown in Fig. 2 andassist in guiding Serial No. 880,901.

The steam header 32 is partially7 surrounded by a. hood 56 which issupported by side members 58 and 60 carried by the channels 38 and 40.This hood forms an outlet broad enough for the gases to pass through theboiler and is provided with a. ianged connection 62 for boltingto astack connection or the like.

The end walls 64 and 66 are builtup ot boiler plates and an interposedlayer ot heat insulating material 65 and a number of doors 68 areprovided therein, these doors as shown in Fig. 7 being normally heldclosed by a releasable locking device 72 pivoted at 7() which, however,is adapted to be disconnected by any suitable means for example bybreaking the pin 71 so as to permit the doors 68 to open outwardly inthe event that an explosion takes place within the boiler.

Balile walls 74 and 7 6 extend transversely across the banks of boilertubes 28 and 30, these walls meeting arched roofs 78 and 80 supported bythe central wall 16. A horizon` tal plate 82 is connected with anglemembers 84 and 86 which assist in holding the roots 8 and 8O inposition.' The plate 82 closes the space between the roofs and formspart ot the lue between the banks of tubes.

Batlle plates 88 and 90'are provided at the` upper part of the boilerand extend approximately half way across thel bank ot' tubes in atransverse direction as clearly shown. The spaces between the baliieplates 88 and 90 and the side members 58 and 60 respectively are closedby plates 92 and 94 which are secured to the channels 38 and 40.

In the boiler constructed as above described it will be seen that thegases which enter he hea-ting compartment 10 through the inlet port 22,iow to the compartments 12 and 14 thence upwardly and outwardly in adirection of the arrows a into the spaces enclosed by the arched boilershells 42 and 44 and thence around the baiiles 7 4 and 7 6 downwardlyand inwardly in the direction of the arrows Z) into the spaces above theplate 82 between the two banks of tubes, thence upwardly and outwardlyabove the battles 88 and 90 in the direction of the arrows c and iinallyupward as indicated by arrows (Z on their way to the stack.

The joints in the shell or casing are all ot' course made air-tight andall joints are preferably closed by interposing a thin strip of asbestosa between the overlapping surfaces as shown in Fig. 8. The steam drum orheader 32 is provided with suitable manholes closed by the usual coverplates 33 sccured in place by bolts 35 passing through bridge pieces 37.The water legs are provided with similar manholes which are closed inlike manner by covers 25. Suitable clean out doors 27 are provided inthe end walls of the boiler' and soot blowers 655 are provided whichproject through the ond walls GLI and 66 of the boiler, these providingmeans whereby the boiler can be periodically cleaned.

The baille walls above relerred to are prelierably torn'ied as shown inFigs. 5 and 6. The boiler tubes 28 ifor example are arranged instaggered relation and the baille walls are 'formed oi' a multiplicityoit diagonally disposed malleable iron plates 29 which are provided witha series oi" notches 3l and 38, the notches 31 on one side ot' the platebeing staggered or offset with respect to the notches S3 on the otherside ot the plate, the pitch ot' these notches corresponding to thedistance on centers between adjacent boiler tube in one row. rl`hebaille walls are Ylori'ned by inserting the plates 29 ed gewise betweena row of tubes and then turning the plate iiatnfise. In this way it willbe appreciated 'that the bailles can be readily assembled and that asthey burn away they can be readily replaced.

In Figs. 3 and 4l I have shown a slightly ,modiiied type oll boileradapted to be heated by fuel introduced into the lire box instead. of bythe use of waste gases coming from a steel ifurnace or other source otwaste heat.

In this modilied iorm oiz boiler I provide a suitable lire box 96enclosed in the masonry Valls 98 and root 100 olf the boiler. rlhe endwalls 102 of the boiler as shown in Fig. 3 extend upward and terminateat 104 and support a pair of steam headers 106 and 108. The latter arejoined by equalizing tubes 110 and 112, the tubes 110 being adapted toper- Imit the iiree passage oi steam from one header to the other andthe tubes 112 to permit the passage of water or water and steam trom onedrum to the other. lVater legs 124; and 126 similar to those shown inFig. 2 are provided with this boiler and these water legs are connectedrespectively with the headers 106 and 108 by banks ot boiler tubes 128and 130. it. side shell 142 lined with lire-brick 148 bridges the spacebetween the water leg 124 and steam header 108 and a similar b 1ick.lined side shell 111i. bridges the space between the water leg 126 andthe steam header 108.

A horizontal wall 182 closes the space between the banks of tubes .128and 130 and baille walls 174 and 176 entend outwardly from this wall andcompel the gases to travel in a circuitous path as indicated by thearrows in Fig. 4, the gases escaping to the stack through a suitableoutlet conduit 156. 'Ihis boiler is provided with suitable eXplosiondoors such as shown lin Fig. 1 and the water legs and the steam headersare provided with `manholes and suitable covers therefor. Both types oiboilers are provided u'ith the usual water inlet pipes 21 and steamoutlet pipes 31 as shown in Fig. 1.

In both forms oi boilers illustrated, the outer arched or bowed walls bytheir shape and location with respect to the water legs, steam headerand the baille Walls, assist in so guiding the gases that they do notencounter abrupt obstructions which would interfere with a smooth anduniform continuous tlow. Considering one side of the boiler shown inFig. 2, the gases are tiret guided across the bank of tubes by thecurved roof 7L/l and baille wall 78 and said gases strike the curvedside shell 42 at such an angle that they tend to curl around and passinward between the baille walls 74 and 88. The gases t'rom one side thenmeet the gases trom the other side oit' the boilerv and the stream oneach side curls outward and then upward to the stack. In the design ofFig. Ll the curved side shells guide the gases in much the same manneralthough only one cross baille Wallis here employed and hence the gasestake a less sinuous path and it is to be noted in this connection thatthe boiler tubes are comparatively longer when this design is used.

Though I have described with great partieularity the details of theembodiments of the invention illustrated it is not to be construed thatI am limited thereto as changes in arrangement and substitution ot'equivalents may be made by those skilled in the art without departingfrom the invention as deiined in the appended claim.

that I claim is A boiler including in combination a pair of lower drums,a central wall lbetween the latter, a steam header above said centralwall, a plurality of banks'of tubes connecting said lower drums and saidsteam header, baille walls extending transversely of said tubes, rootsextending upwardly and outwardly trom said vcentral wall and terminatVing at said baille walls, side walls parallel with said central wallterminating adjacent said lower druu'is, curved side shells tormin gouter ialls opposite said tubes and a casing connected with said sideshells enclosing part of said steam header and having gas outlet formedtherein.

In witness whereof, I have my name.

hereunto signed VILLIAM W. SMITH.

